The man walked up to the Charles/MGH Station at 1:45 a.m. on Aug. 11 and tried to enter the building. When he realized the doors were locked, he kicked out a glass panel on one of the doors and entered the station, police said.

He is later seen on surveillance video inside the station opening his jeans and urinating into the train pit.

He is described as a white man with a muscular build. He was wearing a green camouflage hat, a white V-neck T-shirt, blue jeans and brown work boots.